Abstract
The crack healing behavior and the strength recovery of the newly introduced SiC/spinel nanocomposite were investigated. SiC/spinel nanocomposite containing 27.26wt% SiC was prepared by the ball milling of talc, graphite and aluminum powders with subsequent annealing at 1200°C for 1h in a vacuum. The SEM results showed that the surface cracks produced by Vickers indenter on the prepared SiC/spinel pellets can be completely healed after sintering at 1545°C for 1min in air atmosphere. Furthermore, an almost complete strength recovery of the specimens can be obtained in those samples heat treated at 1550°C for 1min, as evaluated by diametral tensile strength (DTS) test. The formations of mullite and aluminosilicate glassy phases are the major factors which are responsible for the crack healing and strength recovery in the structure. It was found that the healing efficiency of those specimens healed at 1550°C for 1min is 99%.
Published Version
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